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btrfs: read number of data stripes from map only once
There are several places that call nr_data_stripes, but this value does not change. Signed-off-by: David Sterba <dsterba@suse.com>
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@ -2660,18 +2660,18 @@ static int get_raid56_logic_offset(u64 physical, int num,
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u64 last_offset;
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u32 stripe_index;
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u32 rot;
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const int data_stripes = nr_data_stripes(map);
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last_offset = (physical - map->stripes[num].physical) *
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nr_data_stripes(map);
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last_offset = (physical - map->stripes[num].physical) * data_stripes;
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if (stripe_start)
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*stripe_start = last_offset;
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*offset = last_offset;
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for (i = 0; i < nr_data_stripes(map); i++) {
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for (i = 0; i < data_stripes; i++) {
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*offset = last_offset + i * map->stripe_len;
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stripe_nr = div64_u64(*offset, map->stripe_len);
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stripe_nr = div_u64(stripe_nr, nr_data_stripes(map));
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stripe_nr = div_u64(stripe_nr, data_stripes);
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/* Work out the disk rotation on this stripe-set */
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stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot);
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@ -5918,6 +5918,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
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u64 stripe_nr;
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u64 stripe_len;
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u32 stripe_index;
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int data_stripes;
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int i;
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int ret = 0;
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int num_stripes;
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@ -5949,6 +5950,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
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* to get to this block
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*/
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stripe_nr = div64_u64(stripe_nr, stripe_len);
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data_stripes = nr_data_stripes(map);
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stripe_offset = stripe_nr * stripe_len;
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if (offset < stripe_offset) {
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@ -5965,7 +5967,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
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/* if we're here for raid56, we need to know the stripe aligned start */
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if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
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unsigned long full_stripe_len = stripe_len * nr_data_stripes(map);
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unsigned long full_stripe_len = stripe_len * data_stripes;
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raid56_full_stripe_start = offset;
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/* allow a write of a full stripe, but make sure we don't
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@ -5983,7 +5985,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
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stripe (on a single disk). */
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if ((map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) &&
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(op == BTRFS_MAP_WRITE)) {
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max_len = stripe_len * nr_data_stripes(map) -
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max_len = stripe_len * data_stripes -
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(offset - raid56_full_stripe_start);
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} else {
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/* we limit the length of each bio to what fits in a stripe */
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@ -6073,7 +6075,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
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if (need_raid_map && (need_full_stripe(op) || mirror_num > 1)) {
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/* push stripe_nr back to the start of the full stripe */
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stripe_nr = div64_u64(raid56_full_stripe_start,
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stripe_len * nr_data_stripes(map));
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stripe_len * data_stripes);
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/* RAID[56] write or recovery. Return all stripes */
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num_stripes = map->num_stripes;
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@ -6089,10 +6091,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
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* Mirror #3 is RAID6 Q block.
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*/
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stripe_nr = div_u64_rem(stripe_nr,
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nr_data_stripes(map), &stripe_index);
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data_stripes, &stripe_index);
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if (mirror_num > 1)
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stripe_index = nr_data_stripes(map) +
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mirror_num - 2;
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stripe_index = data_stripes + mirror_num - 2;
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/* We distribute the parity blocks across stripes */
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div_u64_rem(stripe_nr + stripe_index, map->num_stripes,
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@ -6150,8 +6151,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
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div_u64_rem(stripe_nr, num_stripes, &rot);
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/* Fill in the logical address of each stripe */
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tmp = stripe_nr * nr_data_stripes(map);
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for (i = 0; i < nr_data_stripes(map); i++)
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tmp = stripe_nr * data_stripes;
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for (i = 0; i < data_stripes; i++)
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bbio->raid_map[(i+rot) % num_stripes] =
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em->start + (tmp + i) * map->stripe_len;
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